Siemens MC35 - Manual (Page 32)

AT Command Set
MC35_ATC_01_V03.02 Page 32 of 228 13.03.2002
2.36 AT&S Set circuit Data Set Ready (DSR) function mode
Write command
AT&S<value>
Response
This parameter determines how the TA sets circuit 107 (DSR) depending on the
communication state of the TA interfacing TE.
OK
Parameter
<value> 0 DSR always on.
1 TA in command mode: DSR is OFF.
TA in data mode: DSR is ON.
Reference
V.25ter Note
Line state refers to RS-232 levels.